If someone is going to set the graphics to low (like I do), then it's likely they care much more about performance and much less about how the game looks.
I cannot express this enough. Please make the "low graphics setting" actually low. You will open up the game to all of those people running budget PCs.
I have it on low, but the difference is little to nothing, I'd like the quality of the level the same, but they should get rid of the background scenes